Backpacks : 18'' Usb Charge Laptop Bag Color: we send based on the color or size of the main image of the product page. we send based on on title, if there is no in the title, we send based on . :The backpack is made of waterproof, breathable and durable materials. The outside and the lining are very good. They are equipped with fine seams, metal zippers and - USB cables.External USB charging and audio socket: A USB charging port is integrated on the side of the backpack, so you can charge your phone on the go without having to open the backpack. There is also an audio jack, you can listen to music anytime, anywhereMany function packages: 29 PC grids are very organized. The three front zipper pockets all extend to the bottom of the bag. One of them is made of waterproof fabric, which can hold damp objects when traveling. 2 side bottles or umbrella bags. 1 large laptop internal compartment with shockproof foam and 2 transport card pockets on the shoulder strap to avoid many daily problemsThe laptop can hold up to 15.6 inches: External dimensions: 13.8 x 6.7 x 18.5", which can be easily installed on a 15.6" laptop. The laptop compartment with soft inner padding provides more shock absorption for your device and prevents scratches and accidental collisions. Soft edge lining provides extra protection for the edgesPadded shoulder straps and practical luggage straps: The shoulder straps are multi-layered, durable, wide, and thick, with a 10mm sponge layer padding, which is well padded and can make your shoulders and Keep your back comfortable The practical card slot on the belt is a great advantage. The luggage strap can secure the backpack to the suitcase. Slide it through the vertical handle tube of the suitcase for easy carryingSpecifications:Model: B00121CColor: black, blue, grayProduct Type: BackpackMain material: OxfordGender: UnisexMode type: solidBackpack type: soft backClosure type: zipperLining Material: PolyesterCapacity: 20-35 litersCarrying system: arched shoulder strapOutside: solid pocketStyle: leisureHandle/strap type: soft handleInternal: internal slot pocket, mobile phone pocket, internal zipper pocket,Inner compartment, computer middle layerSize: 31cm * 16cm * 46cmThe package includes:1 *Laptop bag(The picture does not include other things)